Hardening temperature

Fig. 17. Structuie of U-700 after piecipitation hardening temperature of 1168 C/4 h + 1079" C/4 h + 843 C/24 h + TGO C/IG h with air cooling from each temperature. A grain boundary with precipitated carbides is passing through the center of the electron micrograph. Matrix precipitates are y -Nij(TiAl).

The aftercure and cooling conditions of epoxy materials have a major influence on the quality and properties of the final material. Orlova et al. 92) studied the adiabatic curing of EDS materials by varying the hardening temperature and the degree of conversion of the reactive groups. They developed a mathematical model of the... 

FIGURE 8.5. Influence of hardening temperature on tempering hardness [8.3]. 

Figure 7. Schematic representation of changes in photosynthesis, growth, and carbohydrate storage, due to low (hardening) temperatures. From Levitt 1972.

Thus, the hardening of the toluene diisocyanate-based polyurethane system in the presence of microquantities of the surface-active agent KEP-2 occurs at all stages of the process in conditions different from the ordinary hardening mixture of TMP-TDI-oligoglycol. These differences become apparent in kinetic and structural studies of the hardening process. The final product is a polymer with very weak adhesion compared with the initial specimen (hardening temperature 353 K). 

Resin Hardener Additive Hardening temperature Adhesive strength (MPa) ... 

The standard cold acclimation program used for pine consisted of both a decrease in photoperiod from 17 to 8 h to induce bud formation and a decrease of the PPFD from 250 to 50 umol rn s" when the seedlings were transferred to the cold hardening temperature regime of 4 (2). To address the question of whether cold acclimated... 

No. Hardeniiig time, mill Hardening temperature, C Yield of gel-fractions, %... 

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